The Aladdin MAXbrite model 500 burner was introduced in 2015 with a new naming scheme to go with a new century. The Aladdin side draft burner is a mature burner design that is over 80 years old. The burner design changes have been incremental since the model 21 was introduced in 1953. The changes from the model 21 to the MAXbrite model 500 are more along the lines of burner changes made from the Aladdin model 7 through the model 11.
The Aladdin MAXbrite model 500 is a refinement of the Aladdin model 23A burner. The primary changes in the burner were to maximize light output with the 40 candlepower LOX-ON mantle and to eliminate random air leaks that has plagued model 23 production since the Model 23 England burner was discontinued. Some model 23 and 23A burners had air leaks in the burner that caused flame spikes. The MAXbrite burner eliminates those spikes which kept mantles from being used at full brightness.
The Aladdin MAXbrite model 500 burner also comes with a new redesigned chimney which modifies the airflow around the 40 candlepower mantle to maximize the mantle's light output
The Aladdin MAXbrite burner is a clear improvement over the Chinese manufactured model 23 and 23A burners. My personal experience so far is that my MAXbrite burner works flawlessly. No flame spikes, easy to adjust with a stay cool alloy knob. I believe this is the best burner since the model B burner and is as good as if not better than any previous Aladdin burner.
The Chinese made model 23 burners are poor quality. Aladdin tried to improve the burner quality with the 23A burner as the MAXbrite was being designed and tested. While the MAXbrite looks like a 23A burner the tolerances have been tightened up an the elusive air leaks have finally been eliminated. With the new MAXbrite burner available I personally will never burn a model 23 burner again.
Aladdin MAXbrite 500 uses a larger diameter die cast zinc alloy knob. The alloy is called ZAMAC. The name is an acronym for: Zinc, Aluminum, Magnesium and Copper Alloy. This alloy is not as heat conductive as brass so the knob stays cooler to the touch.